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This reverts commit 047950bb.

Reason for revert: failing arc.Gamepad

Original change's description:
> Add gamepad rumble support in Exo and Wayland.
> 
> - Add exo::Gamepad interface.
> - Add exo::GamepadObserver interface.
> - Add WaylandGamepadVibratorImpl to handle vibration and cancel
> vibration requests from the client.
> - Refactor WaylandGamingSeatDelegate so that WaylandGamepadDelegate
> handles all gamepad-specific events.
> - Add Wayland protocol to support gamepad rumble. The zcr_gamepad_vibrator_v2 interface is created when the server calls
> the vibrator_added event. The client can then trigger/disable vibration
> events on a gamepad vibrator through the interface.
> 
> BUG=b:158686809
> TEST=Add unit tests in gamepad_unittest. All tests pass in
> exo_unittests.
> 
> Change-Id: Ie4b1b3b5f9748f31846c54c97cb4f7c315d09a05
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2313976
> Commit-Queue: Merissa Tan <liyingtan@google.com>
> Auto-Submit: Merissa Tan <liyingtan@google.com>
> Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#798253}

TBR=oshima@chromium.org,xutan@chromium.org,tetsui@chromium.org,prabirmsp@chromium.org,liyingtan@google.com

Change-Id: I39d80057e7bcfda6bbfab5d2ea99d0d94a743aaf
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: b:158686809
Bug: 1116682
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2358690Reviewed-by: Jun Mukai <mukai@chromium.org>
Commit-Queue: Jun Mukai <mukai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798400}